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Carbon puzzle by Donald Osselaer
The version shared by Rich Gain on thingiverse needed the thicker bottom layer trimming off in order to fit together nicely. I downloaded burrtools:
http://burrtools.sourceforge.net/
, and re-exported the puzzle pieces with 0.15mm offset, allowing for easy assembly but keeping the final puzzle piece tight enough. printed a few in different colours on the Kossel Mini.
For more details on the puzzle , designer and the solution see: